Choose the option which means the opposite of the given word.
Parallelism
A. Obliquity
B. Contrast
C. Disparity
D. Divergence

Hint:The given word ‘parallelism’ means the state of being parallel which means having similarities. Example: There is a parallelism between obesity and hypertension. We will look for an option that is contrary in meaning to the given word.

Complete answer:
Let us analyse each option individually to know the correct answer.
A. Obliquity: The word obliquity means deviation from sound thinking, indirectness, confusing statement. Example: His writing has a strange obliquity, I don’t like his books. This word doesn’t express the intended opposite meaning of the given word. Therefore, this is an incorrect option.
B. Contrast: The word contrast means to compare for dissimilar qualities, the difference between two things. Example: There is a contrast between both the governments. This word doesn’t express the intended opposite meaning of the given word. Therefore, this is an incorrect option.
C. Disparity : The word disparity means a noticeable difference, a significant dissimilarity between two things. Example: Economic disparity is a worrying issue in our country. This word means the intended opposite sense of the given word. Therefore, this is the correct option.
D. Divergence : This word means drawing apart, deviating from a course, disagreement, difference . Example: There is a lot of divergence between our opinions. This word doesn’t express the intended opposite meaning of the given word. Therefore, this is an incorrect option.

Hence, the correct answer is option C.

Note: The word ‘contrast’ is close to our answer ‘disparity’ with a difference that in the later, the difference is compared whereas in the latter the difference is significant. More antonyms of the word parallelism are disagreement, dissimilarity. Some synonyms of the same word are comparability, similarity. Example: There is no similarity between us.